115gr HAP bullets

3

308Loader

New member
Hello again everyone, I just picked up a box of 115gr HAP bullets for a decent price. If I'm reading the interwebs correctly it is an XTP without the expansion frills. These bullets are not listed in the Hornady 10th I would assume to use XTP data as far as col and charge weight correct? Another concerning thing I have ben seeing is the recommended start charge weight varies greatly from book to book to powder manufactures website. Hodgdon site has me starting at above Hornady book max. Example - Hodgdon site for HS6 and 115gr HP (.355) bullet START 6.7gr, Hornady book MAX 6.4gr, Nosler book start 6.1 max 7.1, Lyman book start 5.8 to 7.0. COAL differs slightly as well. I understand different components (brass, primer, bullet profile, test gun...) will test differentially, but the spread is pretty extreme from start to max from book to book to web. The spread with tight group is even more extreme if it is even listed.

I have on hand:
Sh!# ton of mixed brass
CCI SPP primers
HS6
Tight Group
500 115gr HAP bullets

Any suggestions? As always thanks for the input.
 
Hello again everyone, I just picked up a box of 115gr HAP bullets for a decent price. If I'm reading the interwebs correctly it is an XTP without the expansion frills. Correct. These bullets are not listed in the Hornady 10th (yes they are, where are you looking?) I would assume to use XTP data as far as col and charge weight correct? Another concerning thing I have ben seeing is the recommended start charge weight varies greatly from book to book to powder manufactures website. Hodgdon site has me starting at above Hornady book max. Example - Hodgdon site for HS6 and 115gr HP (.355) bullet START 6.7gr, Hornady book MAX 6.4gr, Nosler book start 6.1 max 7.1, Lyman book start 5.8 to 7.0. COAL differs slightly as well. I understand different components (brass, primer, bullet profile, test gun...) will test differentially, but the spread is pretty extreme from start to max from book to book to web. The spread with tight group is even more extreme if it is even listed.
Click to expand...

Load data varies. Overall length and the type of bullet (jacketed, plated, cast, swaged) are very important in determining pressure. pay close attention to those features.
 
Page #771 115gr HP XTP no HAP.
Click to expand...

Page 771 in my Hornady 10th is load data for the 458 Lott.

My 9mm load data is on page 866. (Copyright 2016, First printing)

Are you sure it's the 10th Edition? We must have very different manuals.

Either way, the 9mm data, including OAL, should be the same for the HAP and XTP.
 
308,
Check the COAL between Hornady, hodgdon, Lyman, Nosler.
I'd almost be willing to bet they are different.
Small changes in COAL will create big changes in pressure. Especially in a small casing like the 9mm.

Upon looking at said manuals, i see what is going on.
Hodgdon lists a GDHP. Not an XTP.
And Nosler lists, well a Nosler.
The shape and the bullet length are different.
If you looked at Sierra it would be different again.

If your loading XTP, use XTP data.
 
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