stop me if im wrong

[HSNARC]

im starting load workup for my 260

This is what i was planning, A ladder test with both h4350, and rl-17. From what ive read on here and other places i was thinking of starting at 40grains of both and working up to 45 grains in .4 grain increments. Ill be using Win 7mm-08 brass necked down, fed 210 primers, and 123grn sierra match kings. Do you think that's serious danger territory? And yes i will stop at the first sign of pressure.

 

[AMOK!]

Re: stop me if im wrong

Have not necked down 7mm-08 for use in 260. Undertstand these have identical case lengths and O.D.s of 2.035" and 0.473", respectively, but the internal volumes may differ slightly.

The Sierra Reloading Manual (5th ed.) does NOT list a 123gr MatchKing. Perhaps you meant a 120gr MatchKing. If we approach your inquiry using a 120gr MatchKing, we see both the Sierra and Nosler (6th ed.) Reloading Manuals do NOT even list H4350 or RL-17 as an option for the 260 or 7mm-08. However, they both list IMR-4350 and RL15/9.

If we baseline both of these listed powders, we see that Sierra recommends a Starting Load of 38.6gr for IMR-4350 (260 Remington) and 42.7gr (7mm-08 Remington). Nosler's recommendation is 41.5gr (260 Remington) and 45.0gr. You should consult the Reloading Manuals to do the same for your RL15/9.

Here my take on "wild-catting" your brass:

1. Load IAW your reloading manuals (e.g. Nosler, Sierra, Speer)
2. ALWAYS, always start at the minimum load density and advance accordingly.
3. Only use a powder that is listed for both of the cartidges you are wild-catting.

Editorial: If you intended to use a 130gr, the Sierra Manual shows 40.8 gr of H4350 for the 7mm-08 but no H4350 option for the 260.

 

[BobinNC]

Re: stop me if im wrong

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: HSNARC</div><div class="ubbcode-body">im starting load workup for my 260

This is what i was planning, A ladder test with both h4350, and rl-17. From what ive read on here and other places i was thinking of starting at 40grains of both and working up to 45 grains in .4 grain increments. Ill be using Win 7mm-08 brass necked down, fed 210 primers, and 123grn sierra match kings. Do you think that's serious danger territory? And yes i will stop at the first sign of pressure. </div></div>

Per Hodgdon Reloading Center:

260 Rem

120 GR. SPR SP Hodgdon H4350 .264" 2.780" 43.5 2814 51,400 PSI 46.5 2960 58,200 PSI

125 GR. NOS PART Hodgdon H4350 .264" 2.780" 41.0 2714 50,900 PSI 44.3 2867 57,900 PSI

Per Alliant Powder RL17

260 Remington Speer 120 gr SP Remington 2.72 24 Fed 210 Reloder 17 44 2,912

For the 123 Gr SMK I would start at 41.0 Grains H4350, and at 40.0 Grains RL-17.

Bob

 

[HSNARC]

Re: stop me if im wrong



The Sierra Reloading Manual (5th ed.) does NOT list a 123gr MatchKing. Perhaps you meant a 120gr MatchKing.

I knew the box said 123
sierra

But thank you for your info

I went out and shot the ladder this afternoon started at 41.0 of both and went all the way to up to 46.0 grains of both with no pressure signs. As i am too cheap to spring for a chrono yet i have no velocities to report, but it was awesome to finally get to shoot my new rifle.

 

[shootist2004]

Re: stop me if im wrong

my load for 260 4350 and 123smk was 41.7
the 123 has only been around for 2 years so its not in alot of maunals...