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Old 06-13-2018, 01:53 AM
17tbs 17tbs is offline
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Join Date: Oct 2007
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Arrow longer reply, use H4198

Quote:
Originally Posted by Mark527vARMINT View Post
Hi sorry im going to try them in my Weihrauch | HW66 Jagdmatch .17HH. and a cz527HH
H4198 is extremely forgiving in these smaller cases, such as the 17HH, MP300 loaded 0.05 gr over max can cause bigger problems than you may wish to deal with. So, unless you have a digital scale or your powder throwing equipment can manage 0.1 grain accuracy within a tolerance of 0.05 grain then do not use MP300 for max loads in a 17HH without knowing that you are going to loose a few cases. That would be a good rifle to use them in. They are good for accuracy with most of my loads. They might be able to give you great accuracy in some instances. My 17VHA likes 20gr bullets over MP300, or just about any amount of H4198 as long as the 18gr Lehigh bullets close but not touching lands, i.e., 0.005" to 0.010" off the lands as long as the powder load is near max. With more moderate loads of H4198 it likes them touching the lands, such as from 2600 to 2900 feet per second.

The MP300 does well at 8.8gr to 8.9gr MP300 and does not torture the brass, it puts tehm into pretty small clusters and the powder burns cleanly using a Rem 7.5 SR primer. My rifle is by no means designed as a bench rest rifle, so groups under an inch are going to make me happy. MP300 and H4198 do that as long as I steer the pointy end of the rifle in the right direction. H4198 seems to more easily allow smaller groups in my rifle from low to high velocities. MP300 has a sweet spot at about 90 to 95% max load when the bullets are just off the lands.

The Lehigh bullets are bronze, they are supposedly going to offer more resistance to engraving from the lands. So, with these, I would stick to H4198 because it is nearly impossible to overload a 17Hornet with it even using a case full topped with a 25gr Hornady HP. Incidentally the 17Hornet case full of H4198 is how one wildcatter used to load the 25gr Hornady HP, and if I load my 17VHA to the middle of the case neck and top it with a 30gr Kindler Gold, it still does not hurt the primer pockets and cases fall out without getting stuck in the chamber after firing.

Last edited by 17tbs; 06-13-2018 at 01:57 AM.
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