Greetings all,
I imagine this question has been asked many times before, but here it comes again:
What increase in FPS would I expect from each additional inch of barrel length?
I ask the question because I recently purchased a rifle in 6.5 x 53R with a 29 inch barrel. After some considerable searching, have found a set of dies and all the requisite reloading supplies (I've done a fair bit of reloading in past years, BTW).
The load data I have is all for 6.5 x 54 Mannlicher Shoenauer which is identical to the 6.5 x 53R except that it is rimless (and yes, the cases are identical aside from the rim and an extra 1mm neck length).
The load I have used is from a Hornady reloading manual and it specifies 27.4 grains of IMR 4320 behind a 160gr round nose. This should produce about 1700 FPS. I've tried these loads (lowest listed for IMR 4320) and they are mild and show no signs of pressure.
All this is fine, but the load data is all for 18.5 inch barrels and my rifle has a 29 inch barrel. I don't own a chronograph or know anyone that does. Is there a formula or rule-of-thumb which might give me a rough idea of the increase in velocity?
Cheers
I imagine this question has been asked many times before, but here it comes again:
What increase in FPS would I expect from each additional inch of barrel length?
I ask the question because I recently purchased a rifle in 6.5 x 53R with a 29 inch barrel. After some considerable searching, have found a set of dies and all the requisite reloading supplies (I've done a fair bit of reloading in past years, BTW).
The load data I have is all for 6.5 x 54 Mannlicher Shoenauer which is identical to the 6.5 x 53R except that it is rimless (and yes, the cases are identical aside from the rim and an extra 1mm neck length).
The load I have used is from a Hornady reloading manual and it specifies 27.4 grains of IMR 4320 behind a 160gr round nose. This should produce about 1700 FPS. I've tried these loads (lowest listed for IMR 4320) and they are mild and show no signs of pressure.
All this is fine, but the load data is all for 18.5 inch barrels and my rifle has a 29 inch barrel. I don't own a chronograph or know anyone that does. Is there a formula or rule-of-thumb which might give me a rough idea of the increase in velocity?
Cheers
