[nismochasse]

Hello everyone, I have a Remington 700 in .270 Win that I have been reloading for. I have the scope zeroed at 50 yards with Federal 130gr ammo and POA=POI. My reloads are all shifting the POI though.

All of my reloads were hand weighed and used H4831SC, pulled Federal 130 gr SP in a mix of 1x and 2x fired brass, all within the proper measurement. The POA in each picture is the red dot within the pencil circle.

My first loads were on the softer side at 49 gr with an OAL of 3.131 and 3.141. This load is impacting 2" low and 1" left.


My next two loads were 52 gr of H4891.
1st OAL was 3.131 that shot about 1.5" low and 1" left.


2nd OAL was 3.139 and it shot 1" low.


The last load was 54.2 gr with an OAL of 3.141 that shot about 4/3" low and just a little right (minus a flyer).


Can anyone give me any info on what might be changing the POI so much between loads? I realize that different loads will impact different, but will it be that much?

Thanks!

[Wil Terry]

BARREL harmonics. Perfectly normal. Furthermore you are using a propellent far FAR slower than the factorie's.
WHY in the world would you sight in a 270WCF at 50 yards ??

[ColoCG]

Your loads are hitting low because they are very light loads. Anytime you change your loads it will change your point of inpact. The .270 tends to shoot more accuratly in the upper ranges of the loads with H4831. Most of your loads are below starting charges. I usually load 59gr. of H4831 with a 130gr. bullet and get great accuracy. I also sight the load in 2.5 to 3" high at 100 yds. Also what powder is H4891?

[ColoCG]

Start shooting your gun at 100yds. then you can address the problem of where you bullets are hitting.

[fredj338]

Both guys are correct. Rifles are finicky tools. It's not at all ucommon to see shifts of POI when changing powders or changing bullets w/ your fav powder. You also need to get out to at least 100yds. AT 50yds, it tells you little about the load & doesn't put you anywhere near hunting zero, unless you hunt @ 50yds, then the 270 w/ a scope would not be my choice. Also starting charges in high vel calibers rarely shoot well. Get above midrange & start your load dev there in 1/2 increments of 3 shots each.

[nismochasse]

Thanks for the responses! The H4891 is a mistake and is supposed to be H4831. It's zeroed at 50 yards right now because that's what I had when I got the rifle and I haven't moved to a 100 yard lane yet. I'll make sure to move out to 100 next time at the range and bump up the load some.

[PCJim]

nismochasse, sight your rifle in at 25yds instead of the 50yd mark. Doing so in most cases will put the rifle very close to being on target at 100yds due to the bullet's trajectory arch.

Do some Google research (not on this forum) for 25yd rifle sight-in. You'll most likely come across a few diagrams that help to explain this concept.

But, like Fred said, you won't be able to find any good load for your rifle when trying to do so at such a short distance as 50yds (unless you're sighting in a 22LR). Most prefer somewhere close to 300yds and will use the Audette ladder test to determine the best loads for the rifle.

[ColoCG]

Actually with your .270 win loaded to around 2900fps with a good 130gr bullet and sighted in at 25yds. Your load should be zeroed in at about 225+ yds. and around 2.25" high at 100yds.

[nismochasse]

That's good stuff, thanks! I hadn't thought about a 25 yard zero for that.

ColoCG, what OAL and bullet are you using with your 59gr charge? My books list OALs of 3.210 (Hornady) and 3.250 (Lyman) but those OALs are to long for the 130gr bullets

[ColoCG]

Originally Posted by nismochasse

That's good stuff, thanks! I hadn't thought about a 25 yard zero for that.

ColoCG, what OAL and bullet are you using with your 59gr charge? My books list OALs of 3.210 (Hornady) and 3.250 (Lyman) but those OALs are to long for the 130gr bullets

With a 130gr, I use a Nosler Ballistic Tip bullet loaded to a oal of 3.290" in my Ruger 77 and a Rem 700. I have gone longer in my wife's Rem 700 .270 win with the same bullet. I also load the 140gr. Nosler Accubond over 58gr.of H4831 with oal of 3.330" in the Rem. 700. It really depends on your gun's magazine and chamber and throat. The Remington has a longer magazine than my Ruger.

Both of these bullets are longer bullets because of their boattails and plastic inserts in the tips.

[ColoCG]

Originally Posted by nismochasse

That's good stuff, thanks! I hadn't thought about a 25 yard zero for that.

ColoCG, what OAL and bullet are you using with your 59gr charge? My books list OALs of 3.210 (Hornady) and 3.250 (Lyman) but those OALs are to long for the 130gr bullets

Are you using that Federal 130gr. SP bullet. I am not sure of that bullets length or how deep you are seating it, but as long as the bullets base is seated to the bottom of the case neck or basicly one caliber in this case .277" deep that is sufficient.

I know the Hornady manual shows an OAL of 3.210" for even their 130gr. Interbond bullet, but I load it to OAL of 3.335" as it is a long bullet.

As long as your bullet is not seated into the rifling and it fits in your magazine with proper neck tension, there is no set OAL.

Each gun and bullet combination are different.

Usually the closer to the rifling you are without touching it the more accurate your load will be, but not always.

[GioaJack]

^^^^^^^^^^^^^^^^^^^^^ Finally a post that pretty much sums it all up.


Jack

[fredj338]

Originally Posted by ColoCG

Each gun and bullet combination are different.

Usually the closer to the rifling you are without touching it the more accurate your load will be, but not always.

Yep, try seating close to the lands w/ monometals, accuracy oftens sucks until you back off 0.025" or more. They like a bit of a run at it, kind of like Jack & his lady friends.