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Unless your rimfire is a pure target rifle, I don't think it makes much difference. The TRS-25 isn't geared for pinpoint accuracy.
Also, rimfire ammo come in different velocities and bulk ammo is inconsistent at best anyways. I think fps will affect your zero more than the weight of the bullet in this case.
If you buy in bulk and on sale, zero and shoot each batch then move on. Re-zero (if you have to) should not take too long anyways.
Personally, I would rather have reliable functional ammo in a .22 than an average zero.
I see what you want to do. Try to get it so the two zero crossings occur at 25 and 75 yards.
It's not just bullet weight. It's bullet weight (and thus the Ballistic Coefficient) AND the velocity. The BC determines how fast the shape and weight slows down after it leaves the muzzle. And the velocity over the distance traveled determines the rate of drop in the arc of travel.
Finally the height of the red dot over the bore axis plays a part too. Tall mounts vs short mounts and larger receiver vs smaller receiver all play a part in the angle between your red dot axis of view and the bore axis being pointed up to zero in at the 25 yd point during the upward portion of the arc.
To be fair I believe that you will find that 75 yards isn't all that far. With the usual HV ammo and any sort of reasonable height from the red dot to the bore it's likely that your falling zero point will be out more at 100 yards. If you really want a 25 and 75 yard crossing then you will likely need to look at Standard Velocity or perhaps even slower Subsonic ammo options.
As for suggestions about which ammo? Not a clue other than the general feelings I just gave. You'll just simply need to buy a sample box of some different types and try it. If you have some HV then start there. If it proves to shoot high at 75 then buy a 50rnd box of CCI SV or similar. If it still shoots high at 75 with a 25yd zero then look for some even slower subsonic.
If I'm wrong on this idea and your TRS sits lower by quite a lot to the bore than a typical scope does then you may find that you can do a 75yd descending zero with the HV ammo. And at that point if the stuff you have is close then altering the bullet weight will alter the flight arc to push a little one way or the other. But again that will depend on the bullet's BC and velocity.
And the BC is changed by not just weight A more pointy shape will tend to slow down less per time than a blunt or perhaps hollow point shape. So bullet shape and thus the change it makes in the BC value would also be something that you can use to find the right ammo. I'd say the nose shape of the bullets plays as big a part as the two gn steps in weight from 36 to 38 to 40.
I see what you want to do. Try to get it so the two zero crossings occur at 25 and 75 yards.
It's not just bullet weight. It's bullet weight (and thus the Ballistic Coefficient) AND the velocity. The BC determines how fast the shape and weight slows down after it leaves the muzzle. And the velocity over the distance traveled determines the rate of drop in the arc of travel.
Finally the height of the red dot over the bore axis plays a part too. Tall mounts vs short mounts and larger receiver vs smaller receiver all play a part in the angle between your red dot axis of view and the bore axis being pointed up to zero in at the 25 yd point during the upward portion of the arc.
To be fair I believe that you will find that 75 yards isn't all that far. With the usual HV ammo and any sort of reasonable height from the red dot to the bore it's likely that your falling zero point will be out more at 100 yards. If you really want a 25 and 75 yard crossing then you will likely need to look at Standard Velocity or perhaps even slower Subsonic ammo options.
As for suggestions about which ammo? Not a clue other than the general feelings I just gave. You'll just simply need to buy a sample box of some different types and try it. If you have some HV then start there. If it proves to shoot high at 75 then buy a 50rnd box of CCI SV or similar. If it still shoots high at 75 with a 25yd zero then look for some even slower subsonic.
If I'm wrong on this idea and your TRS sits lower by quite a lot to the bore than a typical scope does then you may find that you can do a 75yd descending zero with the HV ammo. And at that point if the stuff you have is close then altering the bullet weight will alter the flight arc to push a little one way or the other. But again that will depend on the bullet's BC and velocity.
And the BC is changed by not just weight A more pointy shape will tend to slow down less per time than a blunt or perhaps hollow point shape. So bullet shape and thus the change it makes in the BC value would also be something that you can use to find the right ammo. I'd say the nose shape of the bullets plays as big a part as the two gn steps in weight from 36 to 38 to 40.
The TRS25 should have be about 1.5 inches above your bore.
The information was entered into a Sierra Infinity program.
Using CCI MiniMags, both HP and RN, if sighted in for 75 yards your rounds will cross at 15 yards.
Sighted in for 25 yards, your bullets will be about 2" low at 75.
I have found the RN to be more accurate that the HP.
Occasionally the HP will hang up on the feeding ramp. RN traditionally feed more reliably.
The red dots I have tried were only sighted in at 25 yards and accuracy was not tested beyond that.
If Stingers are used, a 25 yard sight in will cross the line again around 70 yards and by 0.4" low at 75. Judging from previous experience with the accuracy level with Stingers . . . the information might be accurate with 3 or 4 inches at 75 yards . . . 19 times out of 100!
