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Old 06-12-2018, 11:59 PM
17tbs 17tbs is offline
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Join Date: Oct 2007
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Quote:
Originally Posted by Mark527vARMINT View Post
Hi can i ask what powder you used for the 18gr chaos bullets ? I have some 20grn heading my way and was looking at trying H4198.
Short answer, use the H4198. The Lehigh 20gr HP in my opinion should be easier to load due to a short bt.

Long answer: It depends on what the case capacity is of the cartridge you are sending it downrange with.

MP300 in a 4.6x30mm HK case formed to 17VHA 40 degree shoulder. This gives case capacity of 12.75gr of H2O load is 8.8gr with a Rem 7.5 SR Mag primer. or a 9.7+gr of H4198. Velocity with each is around 3250fps depending upon seating depth.

Seating depth with these should be OFF the lands not engaging them as you can and actually should do with the GSC Solids at 17 and 19gr each.

With the 20 coming your way from PA and your powder of choice being H4198, I would not hesitate to load it in everything up to a 17-223. My best powder in my 17FB and 17M4 actually is H4198, it is also a very close second and actually should be my first choice for all bullets in smaller .172" cartridges such as the .17HH. the 17HH has a typical case capacity of 14.2 to 14.4gr H2O, my 17 VHA 40 deg shoulder is a little less, and it still prefers H4198 for all bullets of 25gr and up. The reason I like it better than MP300 is that it never reaches max pressure for my 17VHA even loading a case full with a 25gr bullet, and this allows my cases to last a long time. MP300 can cause you to wreck your rifle if you are not warry about the loading pressures and especially so near max pressure loadings. However with a smaller case such as the 17VHA, it is the one that outperforms them all with 17grain to 20grain bullets when it comes to velocity and a reduced muzzle flash. My barrels are 16.25" & 18.75" for my 17VHA, 21" for my 17M4 and 26+ for my 17FB. H4198 performs well in all of them, and in my 17FB Rem 700, it gives the top velocity while still being sane with regard to pressures.


17fb 26" REM 700 SPS H4198
CASE FULL TO BOTTOM OF NECK
CCI BR4
17gr GSC SP solid

Last edited by 17tbs; 06-13-2018 at 12:20 AM.
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