Sorting .25cal pellets

both and then do the roll test .

I was doing all 3 for years and got emotional with the process.
Now only resizing to barrel/liner

This is my result after just sorting by weight.

Head size is most important but when you start shooting 100 yards then weight factors into your group size also. You got a good tin there, I routinely get over 2 grain spead, 32.8 to 35.0
Thx
Dan

Tested on 5x5 rings paper @ 100 meters, side by side both the resized and not resized 34 gn MK1 and MK2's.
I can confirm that out of my STX-A liner 1:27 @ 100 meters shooting per 5 group - resized pellets always shifted the groups high right about 2 a clock out of circle 1"-1.5" but tighter groups there.
The multiple tins over 500 shots average the POI group size shrink from 1.5" to almost 1" with resized pellets.
Next step of my testing I indexed the liner to see if changing the group pattern shape, no it didn't happened in my case.
So I reset the scope for couple clicks and resizing my long range pellets ever since, both the .25 and .22.

Just to put some math to the question:

Assuming the .25cal JSB at 34gr —
with a weight variation as bad as XSUltimate reports, 2 grains spread, that is plus or minus 1gr —
shooting with 55FPE = mean MV 854fps —
we get the following vertical stringing (purely from weight variation):


MV variation = ±13fps max. = [edit] 26fps extreme spread

POI variation (vertical stringing) = up to 0.76" (1.9cm) LOW —— and up to 0.81" (2.1cm) HIGH


Matthias

2 grain difference should result in more than 13 FPS spread but that really boils down to a lot of factors/variables.

-Matt

Stubbers said:

2 grain difference should result in more than 13 FPS spread.

Click to expand...

You are right, Matt.

I clarified my post above, like I said it's ±13 variation:
So up to +13 and up to —13
➔ for a total of 26fps extreme spread.

Matthias

JungleShooter said:

You are right, Matt.

I clarified my post above, like I said it's ±13 variation:
So up to +13 and up to —13
➔ for a total of 26fps extreme spread.

Matthias

Click to expand...

Gotcha, that is not a symbol I am familiar with, you're spot on with the 26 though.

-Matt

Used to do both weight and head size. Found that the .25/34 grain FX pellets were very consistent in head size - more so than the JSB 33.95 King Heavy pellets, so I stick with the FX, wash, weigh and lube and don't worry about head size.

What I found more important is the - head circumference and the skirt circumference have a same axis line. To simplify... just double check the roll test with any of your groups. If the pellet is not "rattling" when rolling and all the pallets roll to the same spot on the slope = you are good.
I tried to simplify the steps with Trrobb pellet sizer and I think I can give away all my pellet (head OD) gauges if anybody needs one let me know.

I just sat and measured tins of 21 different pellets and slugs -

While the JSB Exact King Heavy MK II flys really well with my gun, it had the third worst spread of weights from lest to heaviest -

While stated as 33.95 gr, my tin ranged from 33.80-34.75 gr - A range of 0.95 gr

The best measured slug was 0.04 for a whole tin and the worst was a spread of more than 2.00 gr. on a 30 gr slug

I'm interested in how narrow a range you would batch for 100 yards

I don't know anything about resizing and am guessing its maybe more challenging with slugs?