327 mag load question

[sa champion]

I'm loading 327 using both 100 lead & XTP 85 gr bullets
Powder is W231

What I found online is to use 4-5 gr on the lead and 5.3-6.0 on the XTP

Why is more charge used on the lighter bullet?

[ironhorse1]

It is due to friction from the copper jacket and the fact that you can use higher charge weights with lighter bullets.

I have tried most available bullet weights for the .327 and have found that the 100 grain lead and 100 grain XTP bullets seem to work the best overall.

It's an interesting cartridge and I have a Ruger Single Seven to try various load combos.

irh

[sa champion]

Thanks, just starting to load the 327.
I have loaded h&r with that same 100 gr lead using 2.9 gr w231
Pretty mild

[ironhorse1]

You will probably find that the 85 grain bullet will print low on the target.

That it is not out of the ordinary especially if you load for highest velocity.

I use 4 grains of Unique with the Missouri 100 grain cast bullet for my plinking load.

With the 100 grain XTP I have tried H110 and AA#7 both producing nice groups.

Next will be AA#9 and the XTP.

You can use H&R 32 magnum data for reduced loads in the .327.

irh

[sa champion]

BTW, how important is crimp?
Just enough to remove the bell?

[ironhorse1]

Roll crimp the lead over the shoulder. Crimp the jacketed into the cannelure.

This is to prevent bullet jump or set back into the case. Sometimes with light bullets and heavy loads bullets can move forward.

This can lead to several problems. Bullet jump can cause the cylinder to bind up.

Loose bullets with heavy charges can cause a load to squib with the result being lots of unburned powder and a jammed cylinder.

This most likely will happen in a light revolver and is a known problem.

Always roll crimp revolver loads so that the bullet is held tight and the powder can burn properly.

irh

[sa champion]

Thanks, I guess I need to pay attention to crimp
Gun is LCR