Changing load data for new primer and bullet .45 acp

[Big-bore-bob]

Thanks for all the replies. I think ill just do a full work up just to eliminate any variables, plus I'll feel more comfortable with that based on my limited experience. I appreciate everyone sharing their knowledge and expertise! Happy shooting everyone!

 

[Charlie98]

I may be a bit confused and/or incorrect with my assumptions. I'm not necessarily looking for a bullseye load. For my purposes reducing to 1.25 will just keep internal volume the same using the new bullet vs the old one. I kinda want a full power load with reasonable accuracy. Working up from 5.2 I know they will cycle as I've gone as low as 5gr before. Hornady lists 5gr for starting load, 5.7 max @ 1.25. I'm really just trying to be safe and obtain the same level of accuracy as my old component combination. Am I approaching this right?

I mentioned previously that, according to Hodgdon data, you are over max.... and that with the same (Hornady) FMJ-FP bullet... that's why I thought reducing to 5.2grn and working back up, and particularly with your COL, would be the smart choice. I think you are on the right path.

 

[CraigC]

I would only reduce and retest if I were running maximum loads in a rifle. IMHO, a good many of the things reloaders do only applies to rifles and rifle cartridges.

 

[Big-bore-bob]

Well I got out to the range today with the new loads. I used mixed brass. Win lpp. Zero 230gr fmj seated to 1.255-1.256. Temp was 25f. Test platform was hk usp expert 5.2in bbl. I just ended up using three different charge weights for bullseye and hp38 so I didn't have to spend too much time in the cold.

Hp38
5.2gr, SD 19, avg 805, es 62.
5.4gr, SD 31, avg 842, es 106.
5.6gr, SD 10, avg 878, es 36.

Bullseye
4.8gr, SD 17, avg 794, es 67.
5.0gr, SD 15, avg 824, es 47.
5.1gr, SD 8, avg 855, es 24.

It appears the win lpp may make a difference in burn rate for the hp38, the bullseye numbers are in line with my previous testing. It appears with this component combo hornadys data seems spot on for hp38. Using mixed brass may have increased my extreme spreads though. Accuracy was ok for the hp38 loads and excellent for the bullseye it was cold so i was shivering a bit and threw some fliers. I'll test again with same headstamp brass in the future. It looks like I'll stick with 5.3gr hp38, and 5.0gr bullseye for my bulk loading session. Picture is 5.0gr bullseye, 10 shots at 20yds.

 

[nettlle]

Bullseye has always worked best in my 9MM's and 45ACP's. It's an old powder and not trendy these days but when there is a powder panic Bullseye seems to be the worst for not being in stock.