jhei88
Member
Where can i find load data for .40 sw with Hogdon hs6 and berrys 180 grain jacketed hollow points
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180 gr Hornady XTP HS-6 Diameter .400" OAL 1.125" Start 6.1 gr (876 fps) 25,900 PSI - Max 6.9 gr (976 fps) 32,500 PSI
175 gr #2 Alloy HS-6 Diameter .401" OAL 1.125" Start 7.0 gr (940 fps) 17,000 CUP - Max 8.2 gr (1047 fps) 23,300 CUP
I respectfully, absolutely disagree. How does gas cutting and bullet base erosion occur? High pressure powder ignition gas leakage, DUE TO lack of proper bullet-to-barrel fit (typically bullet diameter .001" or greater than the groove diameter of the barrel), insufficient deformation of the bullet base (obturation), inadequacy of lube to seal the bullet to the barrel, etc.; but most importantly, lack of proper bullet-to-barrel fit.noylj said:For lead bullets or thin-plated bullets, your gun will not even KNOW if the bullet was .400, .401, or .402".
Note that Lyman MATCHED the bullet to the bore.
I am in absolute agreement!noylj said:Lead should almost always be AT LEAST 0.001" over groove diameter.
Ummmm, that's because the heavier jacketing is supposed to ride the rifling or the "bore diameter" of the barrel instead of the "groove diameter"? Am I wrong?The "nice" thing about jacketed bullets is they perform well even if they are 0.001" under groove diameter.
My apologies.noylj said:Sorry, you must not have read in context.
Yes, I agree. Often there are threads/posts made complaining "I am having such and such problem with such and such bullet/powder/pistol" and blame is assumed or expressed without verifying all the reloading variables.You see, the bullet diameter debate, without knowing the barrel's groove diameter, has always struck me as a sign of missing the point.
It does happen.Look at 9x19. Groove diameter can range from 0.3545-0.362". Yet, most people go through life assuming their barrel is perfectly nominal at 0.355"
I agree mostly as typical JACKETED bullets are sized at .355" for 9mm, .400" for 40S&W, .451" for 45ACP, etc. I think it would be difficult to obtain true jacketed bullets sized at .356"/.401"/.452" etc. Regardless, at high-to-max load data, there may be enough deformation of the jacketed bullet base (even for JHP bullets with no exposed lead base) to provide enough seal with the barrel to produce consistent enough chamber pressures for accuracy. Many USPSA/IDPA match shooters use JHP loads and my preference over the years have been 40S&W Montana Gold 155 gr FMJ or 165 gr JHP with very acceptable level of shot group accuracy even with using high range load data for match shooting.For best accuracy, jacketed bullets should be groove diameter or very slightly larger. For best accuracy and minimal leading, cast lead bullet should be AT LEAST 0.001" over groove diameter and 0.002" is often better.
It all goes back to NOT knowing your barrel and what it needs/prefers for best performance