Attention: 24" bbl., 7mm Rem Mag. owners

[Dick284]

I am wanting to compile some data from various 7mm Rem. Mag rifles with 24" bbls.

I will put up factory ammunition to be evaluated over my chronograph.

Tests will be done at the Evergreen Range near Drayton Valley.

Suprisingly I only know 2 fellows with 7mm Rem. Mags.

I would like to conduct the tests on the same day.

PM me and we will see what we can work out.

[munyee4321]

Id totally be in on this but man... thats a loooooonnng drive for me lol.

[Andrzej]

Dick

I have Sako Finnlight 75 SS in 7 Rem Mag with 24 and 3/8" barrel as listed by Sako. Is this what you looking for? I will be in Buck Lake area for Christmas for a few days.
Andrew

[TriggerFinger]

"I am wanting to compile some data from various 7mm Rem. Mag rifles with 24" bbls. . . . "
.


Sorry Dick, I cant' help. I don't have my 7mm Rem. Mag anymore. :(

I'm currious though ... why 24" barrels? I always thought that 26" barrels are best for the 7mm Rem Mag. Am I misinformed???

[sbtennex]

PM sent.
Triggerfinger: 7 RM works fine in a 24" - not that much to be gained with an extra couple inches, unlike say the .264 Win Mag, .300 or a .257 W'by, neither of which I'd own in a 24".

[TriggerFinger]

PM sent.
Triggerfinger: 7 RM works fine in a 24" - not that much to be gained with an extra couple inches, unlike say the .264 Win Mag, .300 or a .257 W'by, neither of which I'd own in a 24".



Thanks for bringing me up to speed on this ... I guess I was misinformed. I learn something new almost every time I sign on to this forum!

[bobinthesky]

PM sent.
Triggerfinger: 7 RM works fine in a 24" - not that much to be gained with an extra couple inches, unlike say the .264 Win Mag, .300 or a .257 W'by, neither of which I'd own in a 24".



Care to elaborate on that statement? Why do these other cartridges benefit from a longer barrel and not the 7rm?

[Dick284]

Sorry Dick, I cant' help. I don't have my 7mm Rem. Mag anymore. :(

I'm currious though ... why 24" barrels? I always thought that 26" barrels are best for the 7mm Rem Mag. Am I misinformed???



24" bbls because that seems way more common that 26" bbls.
Factory ammo has velocities quoted from 24" bbls.
Apples to apples that's all.

[roger]

ifn ya want dick i could leave the my 300wsm with the 16" bbl and if someone else has a 26" bbled one. those would be weird numbers.
if the weather holds, i may be cruising thru your way to bc during xmas

[LongDraw]

I have had 3 different 7RM's, one 24", one 26" and my current one with a 27" barrel. It is my conclusion that the particular barrel per se has more to do with the velocity than 2" longer or shorter.

[Tcon]

I have a Savage 111 in 7mm RM, with 24"
Looking to get a chrono right away, but I dont shoot factory ammo :)
I can let you know my handload results, as soon as i get them.

[2430M]

Yeah I have one


but...................:wave:

[Bushrat]

It is my conclusion that the particular barrel per se has more to do with the velocity than 2" longer or shorter.

Well said. Chamber and bore dimensions can have a much greater effect on velocity than barrel length. This is why sometimes folks can't get close to published velocities found in the loading manuals. Many manuals get their data using match chambers which generally as a rule are on the minimum side of chamber specifications and have short throats while factory rifles generally have chambers on the large side of the spectrum with long throats. Those with tight chambers will develope higher pressures and generally give more velocity than a factory rifle with a loose chamber so it is not uncommon for a 22 inch barrelled rifle with a tight chamber to out perform velocity wise a factory rifle with a longer barrel. Even among factory rifles with all the same length barrels comeing off of the same production line it is not uncommon for one rifle to be faster than the other, the reason being is that when they put a new chamber reamer it is of maximum spec and it will cut the largest chamber it will ever cut as everytime it is subsequently used to cut another chamber the chamber it cuts will be smaller than the previous one because the reamers wear down. A rifle that is the 200th in line that day cut with the same reamer will have a smaller chamber as that reamer has worn down and cuts a smaller hole, yet those chambers will all be within tolerance because they allow a wide variation between min and max tolerance and why factory ammo makers make their ammo to fit under the minimum tolerance so it will fit in any rifle. This is why different guns of the same caliber designation from the same maker with same length barrels can give widely varying velocities with the same load. It is also the reason fired brass from one rifle may not even fit in another identical rifle of the same designation.


If you take a 7mm mag with a tight custom chamber and short throat with a 22" barrel it will most likely outperform that same load fired in a sloppy factory chamberd rifle with a 26" barrel. Your mileage may vary, there are so many variations and exceptions concerning this issue that no blanket statement can be made that covers them all.

[CoyoteChallenger]

i have a Parker-Hale 7mm Remington Magnum and it has a 24 inch barrel and is an outstanding rifle that i will hold onto forever.

[packhuntr]

Ive got a Tikka 695 with the 24 inch barrel Dick. Not sure what youve got shaking, but shes seeing some down time now. Let me know, id be more than happy to ship her to ya if all ya wanted were to burn abit of powder, (that is if your having a hard time getting your hands on em) I know she would be in good company:lol:. Might be the kind of favor that could provide me the clout to ask for a wee bit of load Research and Development for her!!