Got some new sierra TMK bullets for my 7mm mag in 160gn and can't find any load data in the books i have. Dont want to go get sierra manual for just that bullet can someone help me out with what powders i can use and what charge it will take. Minimum and maximum loads will be greatly appreciated thanks......
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New sierra bullets TMK
- Thread starter les_
- Start date
ShootistPRS
New member
You can find load data for new bullets on the Sierra web site.
You can also call their 1800 number (1-800-223-8799) to get load data for any bullet and any powder for most any cartridge. That is just part of their customer service.
You can also call their 1800 number (1-800-223-8799) to get load data for any bullet and any powder for most any cartridge. That is just part of their customer service.
The TMK's are secant ogive bullets for higher BC than the standard tangent ogivd MK's. This gives them better wind performance, but be aware that secant ogive bullets tend to be more sensitive to alignment and seating depth. I find a runout gauge can be a good tool to use when working with them.
Don Fischer
New member
I'm wondering, with the loads that fail the run out test, I guess fail is the word. What do you do with them? Tear then down and start over. I've never worried about run out, mostly just do hunting loads.
T. O'Heir,
As I've mentioned before, that's simply not true information in modern times. It was pretty much true in the past, but not today, as explained in this article. The Norma manual mentions that M.L. McPherson measured every 130 grain .270 Bullet made in a pressure test gun using the same load data and case lot and primers and powder lot and got over 30% difference in peak pressure difference just by switching the bullets. That means a load developed to maximum would be past CIP proof load levels with the highest pressure bullet in the group. Bullet weight alone is not adequate to set a load level with.
You drill a hole in a board that the bullet just slips into or jams into near the case mouth and bend it lightly until the runout reading gets smaller. NECO also makes a special tool for multiple calibers to do this.
As I've mentioned before, that's simply not true information in modern times. It was pretty much true in the past, but not today, as explained in this article. The Norma manual mentions that M.L. McPherson measured every 130 grain .270 Bullet made in a pressure test gun using the same load data and case lot and primers and powder lot and got over 30% difference in peak pressure difference just by switching the bullets. That means a load developed to maximum would be past CIP proof load levels with the highest pressure bullet in the group. Bullet weight alone is not adequate to set a load level with.
Don Fischer said:I'm wondering, with the loads that fail the run out test, I guess fail is the word. What do you do with them? Tear then down and start over. I've never worried about run out, mostly just do hunting loads.
You drill a hole in a board that the bullet just slips into or jams into near the case mouth and bend it lightly until the runout reading gets smaller. NECO also makes a special tool for multiple calibers to do this.
Don Fischer
New member
Huh! Didn't know anyone made a tool like that. I'd always just wondered wht was done with them after they were found!
cw308 I mostly hunt and the range I'n willing to shoot at is MPBR for the cartridge and load I'm using. Before hunting I chronograph the loads and get a read out from my chronograph of the trajectory and then fire at those ranges and check the load. I use a 6" target normally. My 243 is mostly for varmint's and predator's and I set it up to a 3" target. Reason being I've seen several time's where the only target was a head sticking out of tall grass. I'll give up a bit of range to keep a bullet in the worse kill zone I think I might get. For my elk rifle this year I'm using my 30-06. Never hunted with one before and be shooting 180gr Hornady SP's and set it for a 6' target of maybe an 8" target. Figure that out after the load is chronographed. Picked an off the wall velocity from the manual for the load, 2650 fps and ran it at an 8" target and came up with MPBR of 290 yds and zero at 247 yds. Bullet would be 3.5" high at 100, -4" at 290 and at 300 -4.9". I've only ever taking a shot at big game over 300 yds ont time in my life and really did it just to say I've done it, 330 yds with a range finder shot with 6.5x06 and a 140gr Hornady SP Have taken two elk with that 6.5x06 load, both one shot kills on cows. Cow tags ar normal for me!
cw308 I mostly hunt and the range I'n willing to shoot at is MPBR for the cartridge and load I'm using. Before hunting I chronograph the loads and get a read out from my chronograph of the trajectory and then fire at those ranges and check the load. I use a 6" target normally. My 243 is mostly for varmint's and predator's and I set it up to a 3" target. Reason being I've seen several time's where the only target was a head sticking out of tall grass. I'll give up a bit of range to keep a bullet in the worse kill zone I think I might get. For my elk rifle this year I'm using my 30-06. Never hunted with one before and be shooting 180gr Hornady SP's and set it for a 6' target of maybe an 8" target. Figure that out after the load is chronographed. Picked an off the wall velocity from the manual for the load, 2650 fps and ran it at an 8" target and came up with MPBR of 290 yds and zero at 247 yds. Bullet would be 3.5" high at 100, -4" at 290 and at 300 -4.9". I've only ever taking a shot at big game over 300 yds ont time in my life and really did it just to say I've done it, 330 yds with a range finder shot with 6.5x06 and a 140gr Hornady SP Have taken two elk with that 6.5x06 load, both one shot kills on cows. Cow tags ar normal for me!