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  #31  
Old 02-04-2020, 10:23 PM
squirrel_slayer squirrel_slayer is offline
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Dungheap got the cute little molly screamers in today.

Man those ought to be a riot!

Looks like mid 2400's may be possible depending how nice it plays.

Thanks Again, George

Last edited by squirrel_slayer; 02-04-2020 at 10:42 PM.
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  #32  
Old 02-04-2020, 10:54 PM
22_boomer 22_boomer is offline
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Quote:
Originally Posted by squirrel_slayer View Post
I want to say people on here have reported the brass doesn't hold up to well at rifle pressures. which i'm pretty close to (45-52K)
I can understand you not liking brass that's a bit thinner.
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  #33  
Old 02-04-2020, 11:03 PM
squirrel_slayer squirrel_slayer is offline
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Originally Posted by 22_boomer View Post
I can understand you not liking brass that's a bit thinner.
I do have a handfull (and actually 1 made it through the case forming process!! ) I guess I could try one and see how it holds up. I plucked it and a random winchester case that made it through the forming as well just to be on the safe side.
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  #34  
Old 02-11-2020, 11:11 PM
squirrel_slayer squirrel_slayer is offline
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Had another gentleman donate some bullets to try in the form of 22 mag ammo. a 30gr jhp and 30gr vmax
Here's the latest lineup.

Man that 30gr V-max just looks too cool! Dug the 40gr armscor jhp and 45gr xtp's out to round out the bunch.

So i'm thinking that 30gr v-max is the sweet spot. length is almost perfect for this guy weight is balanced for screaming speed 2270 ft/sec estimated velocity for a 4" and 2450 for the 5.2"(with a very surprising 400 ft/lbs of energy at the muzzle! that's 9mm +p territory and if one were to want to I don't know do something silly like a 7.5" AR build it shows 2700 ft/sec and 485 ft/lbs of energy. then that ahem 16" folding carbine shows 3100 ft/sec 641 ft/lbs......all hypothetically speaking based off a computer model....but time will tell

Oh and for those who may be curious the 2 different 22 Mag loads I pulled down had 7.4gr of the finest ball powder i've ever seen! almost half tempted to shove it in a case and try it lol.

Oh yeah!

Last edited by squirrel_slayer; 02-11-2020 at 11:27 PM.
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  #35  
Old 02-12-2020, 04:21 PM
GrocMax GrocMax is offline
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Quote:
Originally Posted by squirrel_slayer View Post
Guess I forgot to post this yesterday.

ok i'm so upset with myself!!!! just powered up the chrono and went to log my data and I pressed the wrong button and deleted everything. :faint:

I do remember some of the velocities. 5.2gr were in the mid 2000's, 5.4gr was upper 2200's with one that read 2400 on the nose then things nose bombed.

Here's a quick case measurement rundown. Fresh resized brass measures .373", 4.5gr measured .3745, 5gr measured .3745-.375, 5.2gr .3755, 5.4gr .3755 now all of these plunk in and out of the barrel without issue.

Now is where things changed 5.6gr had erratic velocities from 1700-2100 cases took effort to remove from the chamber and will not drop back into the barrel. case expansion was .377" and weirdly 2/3's of the body of the case has this measurement but the web is still .3755". I shot 1 5.8gr which was 2108 ft/sec and it got stuck in the barrel. I didn't want to damage the extractor so I waited till I got home and used a vice grip to get it out. body diameter was .3775" and web .376" now an intersting thing about this case is if it had a deeper firing pin indent and it looked as it walked to the edge of the primer as if it maybe was trying to tilt the barrel down during the hit?

The primers on all but the 1 mentioned looked the same and they have less primer flow than factory 9mm ammo, likely due to the rifle primer thickness?

All of the loads were starting to cycle the slide with the factory spring.

Any advice would be greatly appreciated. Looks like I need to go a touch slower on the powder or concentrate on the 5.2-5.4gr load.



After plotting Quickloads prediction against my velocities I seen an interesting correlation. My velocities were posting rougly .4-.6gr faster velocities (ie. the 4.5gr load tracks with the 4.9gr estimation, the 5gr with 5.4gr and it ramps up from there) I'm wondering if the small rifle primer was boosting pressures by ~5k psi compared to QL's prediction.

It makes almost perfect sense when plotted. Here's what 5.4gr +.6gr looks like in QL 6.04gr 2259 ft/sec 385ft/lbs 52337 ft/sec which is right in line with what speeds I was seeing. and the loads after that were likely getting toasty and why things went erratic!
This is typical (case base expansion) with sloppy oversized SAAMI style chambers, why the 'small base' reamers have a use. New brass will be .373"-.374" but the chambers are cut to .377"-.378". It will give you a pretty good indicator when the brass gets stressed though.

Yes, rifle primers, and especially magnum primers, can add significant pressure on these small cases. Back off at least .5g when switching primers till you find out which way the primer change put you pressure wise.
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  #36  
Old 02-12-2020, 11:10 PM
squirrel_slayer squirrel_slayer is offline
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Quote:
Originally Posted by GrocMax View Post
This is typical (case base expansion) with sloppy oversized SAAMI style chambers, why the 'small base' reamers have a use. New brass will be .373"-.374" but the chambers are cut to .377"-.378". It will give you a pretty good indicator when the brass gets stressed though.

Yes, rifle primers, and especially magnum primers, can add significant pressure on these small cases. Back off at least .5g when switching primers till you find out which way the primer change put you pressure wise.
Ok good to know. I may try and find some rem 6 1/2's since it's designed for 22 hornet case capacities and see if those help.
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  #37  
Old 02-13-2020, 01:33 AM
dungheap dungheap is offline
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From what I've seen over time, I'd stay away from Rem 6 1/2 primers if you're getting anything near high pressures. Remington 7 1/2, Federal 205 or CCI BR would be better choices IMO.
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  #38  
Old 02-13-2020, 01:36 PM
TinMan TinMan is offline
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Hate Rem 6.5s. They have much thinner cups than the 7.5, BR or 450, and maybe even WSR. I tried them once, and they pierced with loads that were fine with WSR. They pitted the bolt on a brand new Cooper M38 in 22 Hornet.
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  #39  
Old 02-14-2020, 09:08 PM
GrocMax GrocMax is offline
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Sometimes I use a CCI400 on a wildcat with little load info, they will crater bad, blank or pierce a little above 50K PSI.
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  #40  
Old 02-14-2020, 10:17 PM
squirrel_slayer squirrel_slayer is offline
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Ok great info guys. So no go on the 6 1/2's and stick with the cci 400's
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