Load development in the mountains

[Canmarksman]

Had a fun day in the mountains today doing some 100 yards load development with the Nosler 175gr RDF . Looks like I may find a decent load between 43.7 gr and 44 gr . All 5 shot groups and factory Remington barrel .

[marlin1]

some nice shooting there

[Canmarksman]

Originally Posted by marlin1

some nice shooting there

👍 find it strange I’m only getting 2464 FPS with 44gr of reloader 15 . Afterall it was a cold day .

[260 Rem]

I see you have them loaded pretty long... I wonder if the bit of extra boiler room is lowering pressure?

[Nyksta]

Originally Posted by 260 Rem

I see you have them loaded pretty long... I wonder if the bit of extra boiler room is lowering pressure?

But the bullet would grind the lands that much sooner increasing pressure. Longer coal usually increases velocity.

With 44 grains you should be seeing about 2560 with 24 inch barrel. How long is your jump? What is your barrel length

[260 Rem]

I think a “close to lands” or jamb can result in a peak/spike in pressure but not necessarily an overall higher pressure curve?
Maybe try seating further into the case and see what happens? Also, some barrels are slower than others.

[Canmarksman]

Originally Posted by Nyksta

But the bullet would grind the lands that much sooner increasing pressure. Longer coal usually increases velocity.

With 44 grains you should be seeing about 2560 with 24 inch barrel. How long is your jump? What is your barrel length

Barrel length is 20” I was .020” off the lands . I believe it’s about 20 FPS per every inch you add or decrease to the barrel .

[Canmarksman]

Originally Posted by 260 Rem

I see you have them loaded pretty long... I wonder if the bit of extra boiler room is lowering pressure?

I tried another row at magazine length at around 2.855” the groups were opening up quiet bad but at that point I was starting to get some mirage so that test was inconclusive or inaccurate I guess .

[gunluvr]

Originally Posted by Canmarksman

👍 find it strange I’m only getting 2464 FPS with 44gr of reloader 15 . Afterall it was a cold day .

Try lighter bullets. Paper won't know the dif.
Nice photos, BTW.

[Canmarksman]

Originally Posted by gunluvr

Try lighter bullets. Paper won't know the dif.
Nice photos, BTW.

Yes i tend to shoot the 155 gr scenars as well witch I already have a load developed for them , tought I’d try and see how the new Nosler RDF’s perform .
Thanks .