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> Seating depth
Seating depth
@ 08:32 am (GMT) |
Brendon GreigI have played around with different powder loads but haven't tryed changing seating depth loading 243 using 87 grain VMAX seated out as far as I can follow Nathan's books but was wondering what size increments to adjust by to see if it prefers a bigger jump any help would be greatly appreciated |
Replies
@ 03:33 pm (GMT) |
Bryan WebsterRe: Seating depthI do not like the bullet touching the lands myself. Try starting .002" off the lands and set deeper in whatever increments you need to in order to find the right spot. Not rocket science and your rifle will tell you what it wants.My .308 does not seem to give a darn about this as it has a long jump and I could not seat close the lands anyway. With it, I start at what is shown in the reloading manual for that bullet and experiment from there and even then some bullets like the A-max 155 and 168 grain do not seem to care much in it. All rifle barrels as well as rifle makes can be different so it pays to look into it and try. Two local brothers, each with Sako rifles recently started seating touching the lands and gradually backed out finding .002 off the lands was what these two guys' rifles liked. Both were 30/06 Sako Finnlight rifles and I think the rifles were stock as from the factory with no rebarreling done or anything like that. I never saw any of their results like groups etc so cannot comment on their success. |
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@ 06:01 am (GMT) |
Bryan WebsterRe: Seating depthTry this Brendonhttps://www.youtube.com/results?search_query=finding+your+lands |
@ 05:29 pm (GMT) |
Thomas KitchenRe: Seating depthhi Brendondid you see the notes on seating experiment on page 245? i would just keep going along those lines |
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@ 06:47 am (GMT) |
Brendon GreigRe: Seating depthThanks Thomas I new I had read it in one of the books but couldn't remember where cheers Brendon |
@ 04:39 am (GMT) |
mark whiteleyRe: Seating depthHi Brendonif seating depth doesn't help try a different projectile weight your rifle may not like the vmax kind regards Mark |
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@ 05:35 am (GMT) |
Thomas KitchenRe: Seating depthno worrieslet me know how you get one, im starting load development on my 243 using 85gr sierra hp's |
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@ 06:09 am (GMT) |
Brendon GreigRe: Seating depthHi Thomas I have been using the 85 grain serria's and the 87 grain VMAX there is about a 1 inch difference in point of impact with the serria's 1 inch to the left but same height I get about a 3/4 inch group with both have found the VMAX projectiles brilliant on goats so far out to 300 yards regularly turnin the inside of the chest cavity into soup |
@ 08:35 pm (GMT) |
Martin TaylorRe: Seating depthThe 87 v-max is favourite .5 moa and better 243w pill by far, varminting, target or light game & has worked in every rifle l have set them up in. Running without any fussy set up, full size brass, 1/2 grain tests etc. Haven't had a complaint about them yet.I now go straight to 30" jump over ADI 2209, l wont quote powder figures due to scale variation etc but it always seems to end up the same, just inside the max ADI book speck. |
@ 08:53 pm (GMT) |
Bob MavinRe: Seating depthHi GuysI jam into the lands when fire forming cases while hunting, then tune the seating depth. Martin, I've been using Hornady 87 BTHP in my 243 for years now with great results up to Fallow Deer. Bob |
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@ 06:44 am (GMT) |
mark whiteleyRe: Seating depthso have you had any luck with adjusting seating depth Brendon?my 243 did not like light or medium weight projectiles at all, it preferred 105-107gr projectiles and especially vld bergers. but no different than the 87gr v-max the 105gr bergers wont shoot accurately in every rifle. 
berger bullets has put out a paper on how to get vld projectiles to shoot with a very aggressive set of bullet jumps from jam and in all honesty berger vld's are the only projectile I find I need to adjust the seating depth to find where the sweet spot is after I have done the usual powder volume test and found an accurate load which is why I suggested to try a different bullet weight if you could not get better than 3/4 inch groups with that projectile, anyway good luck with it best regards Mark |
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@ 06:35 am (GMT) |
Brendon GreigRe: Seating depthHi guy's thanks for all the advice so far I finally found some time to get to the range today and tested my loads I started with the loads I already had made up which were 10 thou off the lands and as per Nathan's book adjusted by .5mm or 20 thou and 40 thou and 60 thou and just because he said to try 120 thou as I already had some loads made up I decided to just seat them a little deeper and try them so starting load @ 10 thou was large 3/4 inch group 20 thou was 3/4 inch 40 thou was 3/4 inch 60 thou was large 3/4 inch 120 thou was large inch group as I used loads I had already made up I didn't increase powder charge as per the book but will try that as well and get back with my findings it seems happy with 20 to 40 thou jump so that little bit more powder may make a difference have a hunt planned for this weekend so is still good enough for 100 to 200 yards we will be shooting |
@ 01:08 am (GMT) |
Ed SybertRe: Seating depthBrendan:I've just joined the Forum, but I have to comment on your post. With that kind of consistency over a reasonable range of seating depths; I'd suggest that you accept that level of accuracy from the particular combination of bullet, powder charge, etc. "The enemy of Good is Better". You could "use up" much of the useful life of your barrel by unending experimentation. Unless that's what brings you joy. In that case, have you tired other primers, brand of brass cases, weight grouping the brass, etc? Cheers, Ed Sybert |
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@ 04:18 pm (GMT) |
Brendon GreigRe: Seating depthHi Ed I have pretty much come to that conclusion as my hunting mate says dead is dead and at the ranges i use it I can place my shots well enough to make this happen rapidly |
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