7 mm rem mag and ramshot grand

[archeratlrg]

Got a winchester xpr 7 mm rem mag with factory 26 inch tube. I was doing some chronograph reading using 150 accubond I ran loads till I hit pressure backed off 1 grain no pressure but my velocity was was extreme 3376 fps . Has anyone else had this kind of velocity

Yes sir, I get 3355 with 71.5 gr of H4831sc in my M700, 7mm Rem mag and 3440 with 140's and 72.5 gr.

 

[cajun]

Yes sir, I get 3355 with 71.5 gr of H4831sc in my M700, 7mm Rem mag and 3440 with 140's and 72.5 gr.

Nosler's max load is 65 gr H4831sc at 3080 or 3130 ish with a 26". Also hogdon data lists about 3200 ish with 150's and grand. How many firings are you getting with those loads? If I had to guess those loads are well above 65k.

 

[JamesWilson5]

I've seen that kind of big jump in speed with bad carbon ring fouling. Have you bore scoped it?

No i hadn't gun is practically new less than 40 shots space out

 

[JamesWilson5]

Nosler's max load is 65 gr H4831sc at 3080 or 3130 ish with a 26". Also hogdon data lists about 3200 ish with 150's and grand. How many firings are you getting with those loads? If I had to guess those loads are well above 65k.

No ejector mark or hard bolt hadn't loaded but just a few 2nd fire on all ready fired brass

 

[JamesWilson5]

76 fps is Mind blowing? Hmmmmm. I would expect nothing less reloading over using factory. Were you expecting to be slower? You loaded till you hit pressure....all factory are SAFE LOADED...well under pressure max for liability reasons.

Well I was looking for pressure signs but didn't see any but loaded some 7828ssc only got 3150 same bullets and did hit pressure

 

[JamesWilson5]

So far i have tried it in 6.5 prc bout same as h1000. Tried it in 7mm rem and rum and it alot faster than h1000 and 7828 tried it in 300 win got 3200 with 3/4 inch group with 180 grain power point. Couple hours ago tried it in 338 rum 270 grain eldx bout 50 fps slower than h1000 and finish off with 338 378 weatherby 270 eldx and it was nearly 200 fps slower than h1000 2950 with grand and 3117 with h1000 if any of that helps someone and this took awhile only chronograph test today with the weatherby and rum